fix(deps): update vuepress monorepo to v1.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@vuepress/plugin-back-to-top	dependencies	minor	1.4.1 -> 1.5.0
@vuepress/plugin-google-analytics	dependencies	minor	1.4.1 -> 1.5.0
@vuepress/plugin-pwa	dependencies	minor	1.4.1 -> 1.5.0
vuepress	devDependencies	minor	1.4.1 -> 1.5.0

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Release Notes

vuejs/vuepress

### [`v1.5.0`](https://togithub.com/vuejs/vuepress/blob/master/CHANGELOG.md#​150-httpsgithubcomvuejsvuepresscomparev141v150-2020-05-11) [Compare Source](https://togithub.com/vuejs/vuepress/compare/v1.4.1...v1.5.0) ##### Bug Fixes - **$core:** include polyfills correctly (close [#​1168](https://togithub.com/vuejs/vuepress/issues/1168)) ([#​2317](https://togithub.com/vuejs/vuepress/issues/2317)) ([69c193a](https://togithub.com/vuejs/vuepress/commit/69c193a)) - **$core:** no dynamic import style ([#​1490](https://togithub.com/vuejs/vuepress/issues/1490)) ([c80c36b](https://togithub.com/vuejs/vuepress/commit/c80c36b)) ##### Features - **$markdown:** snippet partial import ([#​2225](https://togithub.com/vuejs/vuepress/issues/2225)) ([2f1327b](https://togithub.com/vuejs/vuepress/commit/2f1327b)) ##### Reverts - **fix($theme-default)**: close dropdown on mouseout (fix [#​2227](https://togithub.com/vuejs/vuepress/issues/2227))" ([f54b389](https://togithub.com/vuejs/vuepress/commit/f54b389)) #### [1.4.1](https://togithub.com/vuejs/vuepress/compare/v1.4.0...v1.4.1) (2020-04-15) ##### Bug Fixes - **$core:** missing 404 page (close [#​2248](https://togithub.com/vuejs/vuepress/issues/2248)) ([#​2250](https://togithub.com/vuejs/vuepress/issues/2250)) ([28a4eab](https://togithub.com/vuejs/vuepress/commit/28a4eab)) - **$plugin-search:** match non-ASCII chars (close [#​2242](https://togithub.com/vuejs/vuepress/issues/2242)) ([#​2283](https://togithub.com/vuejs/vuepress/issues/2283)) ([9f3f49c](https://togithub.com/vuejs/vuepress/commit/9f3f49c)) - **$shared-utils:** fail to resolve markdown-it plugins (close [#​2286](https://togithub.com/vuejs/vuepress/issues/2286))([#​2289](https://togithub.com/vuejs/vuepress/issues/2289)) ([16df156](https://togithub.com/vuejs/vuepress/commit/16df156)) - **$theme-default:** close dropdown on mouseout (fix [#​2227](https://togithub.com/vuejs/vuepress/issues/2227)) ([#​2303](https://togithub.com/vuejs/vuepress/issues/2303)) ([430b917](https://togithub.com/vuejs/vuepress/commit/430b917)) - duplicate meta tags ([#​2164](https://togithub.com/vuejs/vuepress/issues/2164)) ([01cd096](https://togithub.com/vuejs/vuepress/commit/01cd096))

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